Patent GB-183286-A (GB)
Title: Improvements in locks operated by revolving-barrel mechanism
IPC: E05B55/00
Filed: 1921-05-07
Abstract: 183,286. Motz, F. May 7, 1921. Locking sliding latches; latches, preventing operation of; night latches.-In night latches provided with a revolving-barrel lock on both sides of the door, a member movable independently of the latch is provided, to be displaced by the operation of the inner revolving-barrel, and in some cases by the outer revolving-barrel, to lock either the latch or the latch-operating handle, or both. Figs. I and II show the device in which the movable member 7 is operated by both the inner and outer revolving-barrels 2 and 4 respectively, and locks both the latch 29 and the latchhandle 13. When the key 3 is inserted into the revolving-barrel lock 2 the pin-tumblers are released and the barrel can be turned, revolving the disc 5 at its end. A projection 6 on the disc 5 first releases a spring tumbler 16, pivoted at 17, from its engagement with the lug 14 on the movable member or slide 7, and then displaces the slide 7. Rotation of the key in one direction causes an arm 8 on the slide to engage a projection 9 at the end of the pivoted tumbler 10, locking the hook 10<a> of the lever in a notch in the latch, and the projection 9 in a notch in the follower 12 of the handle 13, preventing movement of both latch and handle. Opposite rotation of the key frees the latch and handle. The same operations may be effected by the outer revolving- barrel lock 4, the slide 7 and tumbler 16 having cranked parts 20, 21 connecting them respectively with extensions 7<1>, 21<1>, which are operated upon by the disc 23 and projection 24 at the end of the revolving-barrel 4 in the same way as the disc 5 and projection 6 act upon the slide 7 and tumbler 16. From the inside, the latch is retracted by the knob 13 and the follower 12, and from the outside, by the follower 25 rotatably fitted on the bearing 22 rigidly connected with the revolving-barrel of the lock 4. The projection 24 on the disc 23, which operates the slide 7', has a pin 28 which engages the spring pin 26 on the rotatable follower 25 after the slide has been released, so that further rotation of the barrel 4 and disc 24 rotates the follower 25 to retract the latch. If the barrel 4 is rotated through one complete turn, and the key 3 withdrawn, the pin-tumblers lock the barrel with the latch fully retracted. In the modification shown in Fig. IV, the handle only is locked. The projection 8 on the slide 7, 7' moves a member pivoted at 32 so that an arm 31 enters the handle spindle to lock it. The member may be rocked to lock or release the handle by either the inside or outside revolving barrel lock. Fig. VI shows a further modification in which the inside revolving-barrel lock only can operate the slide 7, and in which both handle and latch are locked. An extension 31 on the slide can enter a hole 35' in the handle spindle, one hole 35<1> allowing the handle to be locked when the latch is shot, and two others, one on each side, allowing it to be locked when it has been turned and the latch retracted. Fig. IX shows a modification in which only the inside revolving-barrel can operate the movable member, and in which the handle only is locked. A member 39 is pivoted on the revolving-barrel 2 and has a projection 40 engaged by the projection 6 on the disc 5. Rotation of the barrel turns the disc 5 and causes the projection 6 to move the member 39 to engage or disengage a projection at its end with or from notches 38 in a disc 37 fixed to the handle spindle, a spring detent 41 holding the member 39 in its engaged or disengaged position.